Proverbs 22:21

that I might make thee know the certainty of the words of truth, that thou mightest answer the words of truth to those that send unto thee?

Luke 1:3-4

it seemed good also to me, after having understood all the things from the beginning with great diligence, to write them unto thee in order, most excellent Theophilus,

1 Peter 3:15

but sanctify the Lord God in your hearts, and be ready always to respond to every man that asks you a reason of the hope that is in you with meekness and reverence,

John 20:31

but these are written that ye might believe that Jesus is the Christ, the Son of God, and that believing ye might have life in his name.

1 John 5:13

These things I have written unto you that believe in the name of the Son of God, that ye may know that ye have eternal life and that ye may believe in the name of the Son of God.

Treasury of Scripture Knowledge

Summary

That I might make thee know the certainty of the words of truth; that thou mightest answer the words of truth to them that send unto thee?

Answer

General references

Bible References

I

Luke 1:3
it seemed good also to me, after having understood all the things from the beginning with great diligence, to write them unto thee in order, most excellent Theophilus,
John 20:31
but these are written that ye might believe that Jesus is the Christ, the Son of God, and that believing ye might have life in his name.
1 John 5:13
These things I have written unto you that believe in the name of the Son of God, that ye may know that ye have eternal life and that ye may believe in the name of the Son of God.

Answer

1 Peter 3:15
but sanctify the Lord God in your hearts, and be ready always to respond to every man that asks you a reason of the hope that is in you with meekness and reverence,

General references

Proverbs 18:20
A man's belly shall be filled with the fruit of his mouth, and with the product of his lips shall he be filled.